Skype

Skype is an application that allows you to make voice and video calls, make online conference calls, send text messages, and share files -- all at no cost. It's a great tool for working on projects with colleagues or classmates and for faculty holding virtual office hours. All you need is a broadband internet connection, a Skype account, the free Skype application, a microphone, and a webcam.

More advanced options are available at a competitive cost, including sharing your computer screen over the Internet, group video calls, telephone calls (to land lines or mobile phones), and SMS (text messaging to mobile devices.